dhtmlxCombo can be used in four modes: editable select box – the user can either select a value from the list or type a custom value; read-only select box – the user can select just one value from the associated list of choices; filter – the whole list is loaded on the client-side, and as user begins to type, the list is updated with the appropriate values (which contain or begin from the characters typed); autocomplete – the list is loaded and shown as the user types in the input box.

Like other dhtmlx components, dhtmlxCombo provides complete Javascript API to give developers enough possibilities to control its state and behavior.